Currently, you cannot yet merge your accounts. If you are a user on more than one account, you can easily switch back and forth between the accounts. To do this:
Click on your Profile (avatar)
Choose Switch Account
You'll see a list of accounts that you are a team member of
Choose the account you want to work on
If you’d like to move boards between accounts or duplicate them from one account to another, you can do this by using the export to Excel feature combined with our brand new import from Excel feature!
To export the board you’d like to move to Excel, click the Hamburger Menu Icon and then on Export to Excel.
To import the Excel spreadsheet which you’ve exported to a new board on another account, enter that account, click on the board where you’d like to import the data and use these easy to follow instructions: Can I upload an Excel spreadsheet into a board?